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The refractor NA140SS is characterized by an excellent quality / price ratio due to the development by the Vixen a new optical scheme called Neo-Achromat (NA). p>
Normally, in a refractor, the aberazzione color increases with decreasing focal ratio. This is especially true for refractors focal ratio less than f / 8 and with a diameter greater than 120mm. To obviate this drawback the Vixen has created an optical diagram, consisting of four achromatic lenses arranged in two groups, which enables the instrument to provide images with a ' chromatic aberration considerably more limited compared to refractors achromatic the same focal ratio b>. p>
With this optical scheme are also better corrected spherical aberration and field curvature B> (the pair of rear lens acts as field flattener).
For this Vixen NA140SS acts like a semi-apochromatic refractor b>, able to guarantee high performance in both visual observations both in the photo shoots.
L '< b> intubation is particularly accurate b>, as with all the tools of home Vixen: the optical tube, thanks to the materials used, is very robust but at the same time is among the lightest in its class the focus is via the focuser 60mm double speed b>. p>
|Optical system b> td>||VIXEN NEO Acromat (4 lenses in two groups), multi-coated td> tr>|
|Open b> td>||140mm td> tr >|
|Focal length b> td>||800mm td> tr>|
|f 5.7 td> tr>|
|Magnitude limit b> td>||12.5 td> tr>|
|Power separator b> td>||0.82 "" td> tr>|
|Line Size b> td>||140mm td> tr>|
|Tube length b> td>||1024 td> tr>|
|Weight b> td>||6.5kg td> tr>|
|diameter focuser b> td>||60mm td> tr>|
|Standard b> td>|
< / td> tr> table> "
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